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Netskope NSK101 Exam - Topic 3 Question 38 Discussion

Actual exam question for Netskope's NSK101 exam
Question #: 38
Topic #: 3
[All NSK101 Questions]

A company is attempting to steer traffic to Netskope using GRE tunnels. They notice that after the initial configuration, users cannot access external websites from their browsers.

What are three probable causes for this issue? (Choose three.)

Show Suggested Answer Hide Answer
Suggested Answer: B, C, D

In this scenario, there are three probable causes for the issue of users not being able to access external websites from their browsers after attempting to steer traffic to Netskope using GRE tunnels. One cause is that the configured GRE peer in the Netskope platform is incorrect, which means that the Netskope POP that is supposed to receive the GRE traffic from the customer's network is not matching the IP address of the customer's router that is sending the GRE traffic. This will result in a failure to establish a GRE tunnel between the customer and Netskope. Another cause is that the corporate firewall might be blocking GRE traffic, which means that the firewall rules are not allowing the GRE protocol (IP protocol number 47) or the UDP port 4789 (for VXLAN encapsulation) to pass through. This will result in a failure to send or receive GRE packets between the customer and Netskope. A third cause is that the route map was applied to the wrong router interface, which means that the configuration that specifies which traffic should be steered to Netskope using GRE tunnels was not applied to the correct interface on the customer's router. This will result in a failure to steer the desired traffic to Netskope. The pre-shared key for the GRE tunnel is incorrect is not a probable cause for this issue, as GRE tunnels do not use pre-shared keys for authentication or encryption. Netskope does support GRE tunnels, so this is not a cause for this issue either.Reference:[Netskope Secure Forwarder],Netskope Security Cloud Operation & Administration (NSCO&A) - Classroom Course, Module 3: Steering Configuration, Lesson 3: Secure Forwarder.


by Teddy at Jul 09, 2025, 09:25 AM

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Wilda
2 months ago
Pre-shared key issues are common, good point!
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Kirby
2 months ago
Wait, does Netskope even support GRE tunnels?
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Alease
2 months ago
Totally agree, check the firewall too!
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Van
3 months ago
GRE peer config might be off.
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Brynn
3 months ago
Route map misconfig could definitely cause this.
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Owen
3 months ago
I’m not convinced that Netskope doesn’t support GRE tunnels; I thought I read somewhere that they do. Maybe I should double-check that.
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Ashley
3 months ago
What if the corporate firewall is blocking GRE traffic? I feel like that could be a common oversight in setups like this.
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Ryan
4 months ago
I think the GRE peer configuration could be a factor too. We had a similar practice question where that was the issue.
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Kimbery
4 months ago
I remember we discussed how an incorrect pre-shared key could definitely cause connectivity issues, but I'm not entirely sure if it's the main problem here.
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Theodora
4 months ago
Netskope not supporting GRE tunnels? That seems unlikely, but I'll make sure to verify that as well, just to be thorough.
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Trinidad
4 months ago
I'm feeling pretty confident about this one. The pre-shared key and the configured GRE peer are the first things I'd double-check, and the corporate firewall blocking GRE traffic is a common problem to watch out for.
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Iluminada
4 months ago
I'm a bit confused by the route map part. I'll need to review my notes on that to make sure I understand how it could be causing the issue.
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Barrett
4 months ago
Okay, let's see. The pre-shared key, the configured GRE peer, and the corporate firewall blocking GRE traffic all seem like reasonable possibilities to check.
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Janessa
5 months ago
Hmm, this seems like a tricky one. I'll need to carefully consider the possible causes and make sure I don't miss anything.
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Myra
6 months ago
Ah, the classic GRE tunnel conundrum. I bet they have the wrong flavor of Doritos on hand to solve this one.
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Peggie
5 months ago
B: Maybe the configured GRE peer in Netskope is incorrect.
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Lai
5 months ago
A: It could be the pre-shared key for the GRE tunnel.
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Lottie
7 months ago
E? Really? Netskope not supporting GRE tunnels? That's just absurd. Someone's been living under a rock.
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Josphine
6 months ago
E) Netskope does not support GRE tunnels.
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Alyssa
6 months ago
C) The corporate firewall might be blocking GRE traffic.
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Ivory
6 months ago
A) The pre-shared key for the GRE tunnel is incorrect.
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Lacey
7 months ago
I believe the corporate firewall blocking GRE traffic could be another possible cause.
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Rashida
7 months ago
D sounds like the culprit to me. Route maps can be tricky, and it's easy to apply them to the wrong interface. Happens all the time.
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Bettina
7 months ago
D) The route map was applied to the wrong router interface.
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Remedios
7 months ago
C) The corporate firewall might be blocking GRE traffic.
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Bev
7 months ago
A) The pre-shared key for the GRE tunnel is incorrect.
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Letha
7 months ago
I'm going with C - the corporate firewall is probably blocking the GRE traffic. That's always the first thing I check.
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Karl
7 months ago
I agree with Noelia. The GRE peer in the Netskope platform might also be incorrect.
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Leah
7 months ago
The pre-shared key is definitely the problem. I can't believe they'd mess that up. Rookie mistake!
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Raul
6 months ago
D) The route map was applied to the wrong router interface.
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Omega
7 months ago
C) The corporate firewall might be blocking GRE traffic.
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Adolph
7 months ago
A) The pre-shared key for the GRE tunnel is incorrect.
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Noelia
8 months ago
I think the pre-shared key for the GRE tunnel could be incorrect.
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